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    INTER-FREQUENCY HAND-OFF METHOD AND DEVICE FOR RADIO COMMUNICATION SYSTEM
    21.
    发明专利
    INTER-FREQUENCY HAND-OFF METHOD AND DEVICE FOR RADIO COMMUNICATION SYSTEM 失效

    公开(公告)号：JP2000013842A

    公开(公告)日：2000-01-14

    申请号：JP8301399

    申请日：1999-03-26

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： BERNSTEIN NEIL E ,  KUO WEN-YI ,  MEYERS MARTIN HOWARD ,  WANG XIAO ,  WEAVER CARL FRANCIS ,  WU XIAO CHENG

    IPC: H04W36/14 ,  H04Q7/22 ,  H04J13/00

    Abstract: PROBLEM TO BE SOLVED: To avoid unnecessary tuning and searching with a new frequency by controlling the hand-off from the frequency of a call under processing to the new frequency by means of a trigger metric that is obtained as a function of total sum of the mean transmission signal/noise ratio measurements. SOLUTION: A processor 36 controls the communication function of a mobile station 12 in cooperation with a memory 38. For instance, the data included in a message forming a part of a receiving signal or other information are supplied to the processor 36 and a process step is executed. Then the electric power and the signal/noise ratio are measured to the receiving signal, and a message is generated, inserted into a transmitting signal and transmitted to one or plural base stations. Then the hand-off is controlled to the new frequency from the present frequency of a call under processing using a trigger metric generated as a function of the total sum of average transmission signal to noise ratio measurements to at least a subset of the average transmission signal to noise ratio measurements to a pilot signal and a plurality of pilot signals.

    AGGREGATE OVERLOAD POWER CONTROL
    23.
    发明专利
    AGGREGATE OVERLOAD POWER CONTROL 未知

    公开(公告)号：CA2311901A1

    公开(公告)日：2001-01-19

    申请号：CA2311901

    申请日：2000-06-16

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： WEAVER CARL FRANCIS ,  THOMAS MATHEW ,  KAMEL RAAFAT EDWARD ,  BI QI ,  EIBLING EDWARD ELLIS ,  KUO WEN-YI

    IPC: H04J13/00 ,  H03G3/30 ,  H04B7/005 ,  H04B7/26 ,  H04Q7/30 ,  H04Q7/36

    Abstract: A method that changes the power level of a set of forward-link signals, independent of the individual power control of each of the forward-link signals in the set, responsive to a comparison of the signal set's power level and a threshold power level (P th ). The threshold power level (P th) is based on the base station's (200, 400) amplifier's (15 0) maximum threshold power level. The power level of the set is changed by scaling it by a scalin g factor. The total power level (P[n-1]) of the set is obtained during a current frame, and then the scaling factor (g[n]) that will be used in the subsequent frame is determined. The scaling factor (g[n]) is preferably based on the total power level (P[n-1]) of the set for the curren t frame, a scaling factor (g[n-1]) used during the current frame, and a threshold power level ( P th). The amount by which the total power level exceeds the amplifier's maximum continuous power level is the overload amount. The scaling factor is selected so that for each frame the overload amount is reduced by a percentage. For example, the overload amount can be reduced by 3% for the current frame, then the percentage may be changed for a subsequent frame based on th e scaling factor of the current time period and the overload amount of the subsequent time perio d. The set caninclude all of the signals amplified by the base station's amplif ier (150); alternatively, the set can include fewer than all the signals generated by the base station. For example, the set can include a plurality of the traffic signals, or a plurality of the traffic signals and one or more of the control signals. When the base station includes a plurality of amplifier s, each for amplifying a set of signals, the above process can be performed for each of the sets of signals.

    25.
    发明专利
    未知

    公开(公告)号：BR0000081A

    公开(公告)日：2000-12-05

    申请号：BR0000081

    申请日：2000-01-18

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： KOO YUEN-YIN L ,  WEAVER CARL FRANCIS ,  MEYERS MARTIN HOWARD ,  KUO WEN-YI

    IPC: H04B1/7075 ,  H04B1/7097 ,  H04B7/005 ,  H04B7/26 ,  H04Q7/32

    Abstract: The present invention is an apparatus and method for calculating the transmit power of a mobile station by including an interference correction term in every access probe of the mobile station to more correctly estimate the path loss. The interference correction term accounts for the presence of base station pilot signals when calculating the transmit power. Importantly, the present invention is implementable in any CDMA based communication system. In an exemplary embodiment of the present invention, a mobile station implements open loop power control by determining an interference correction term that accounts for the detection of non-active-set pilot signals, thermal noise, or non-CDMA interference, one or more of which are indicated by the detection of a given receive threshold. The mobile station then adjusts its open loop transmit power (access probe power in access state) based on the interference correction term. In a further embodiment, the interference correction term is limited to a maximum level of correction for the case when an active pilot is not detected. In an additional embodiment, the non-active-set pilot power is approximated to all received pilots other than the largest active-set pilot.

    26.
    发明专利
    未知

    公开(公告)号：BR9904341A

    公开(公告)日：2000-09-05

    申请号：BR9904341

    申请日：1999-09-16

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： KAMEL RAAFAT EDWARD ,  WEAVER CARL FRANCIS ,  MEYERS MARTIN HOWARD ,  YI-KUO WEN

    IPC: H04B7/26 ,  H04B7/005 ,  H04W52/24 ,  H04W52/50 ,  H04Q7/38

    Abstract: A method and apparatus that permits base stations to adaptively set initial power levels in forward link traffic channels (i.e., base station to mobile unit) based on an interference measure, where the interference measure is the difference between the base station transmitted pilot Ec/Io and the mobile unit received pilot Ec/Io. The interference measure indicates how much interference is present from other base stations in the mobile unit's locale, mobile receiver noise and other similar sources. Call quality and system capacity are optimized since the initial power level is set in accordance with the interference environment. The method of the invention implements the adaptive setting by extracting the mobile unit received pilot Ec/Io from the access message transmitted by the mobile unit. The interference measure is then determined and used by the base station to set the initial power level in the forward link traffic channel.

    SYNCHRONIZATION OF TRANSMIT POWER LEVEL SETTINGS FOR SOFT-HANDOFF IN WIRELESS SYSTEMS BY THE USE OF POWER LEVEL CONSTRAINTS
    28.
    发明专利
    SYNCHRONIZATION OF TRANSMIT POWER LEVEL SETTINGS FOR SOFT-HANDOFF IN WIRELESS SYSTEMS BY THE USE OF POWER LEVEL CONSTRAINTS 未知

    公开(公告)号：CA2313555C

    公开(公告)日：2004-04-20

    申请号：CA2313555

    申请日：2000-07-06

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： WU XIAO CHENG ,  WEAVER CARL FRANCIS

    IPC: H04B7/005 ,  H04B7/26 ,  H04W52/12 ,  H04W52/36 ,  H04W52/40 ,  H04Q7/36

    Abstract: Base station in a soft handoff programmed to have a threshold power level to control the power transmitted by the base station on the forward link. When the threshold power level is a minimum-threshold power level, each base station (312, 314, 316, 612, 614, 616) maintains its transmit power level at or above the minimum-threshold power level. When the threshold power level is a maximum-threshold power level, each base station (31 Z, 314, 316, 612, 614, 616) maintains its transmit power level at or below the maximum- threshold power level. Preferably, all power levels are expressed in decibels (dB) relative to the pilot's power level. The threshold power level can be adjustable or fixed. In the case whe re the threshold power level is fixed, each base station is programmed with the fixed thresho ld power level, and each base station decides how to adjust its transmit power level locally bas ed on the fixed threshold power level without input from other base stations. In the case where the threshold power level is adjustable, the threshold power level is adjusted by a threshold step size responsive to the transmit power level being substantially equal to the threshold power level for at least a predetermined percentage of a time period. There are two alternatives on how each base station decides how to adjust its transmit power level. In one alternative, each base station (312, 314, 316) participating in a soft handoff sends its power control information to a processor (328) which adjusts the threshold power level and notifies each ba se station of the new adjusted threshold power level. In the meantime, each base station uses its current threshold power level to locally adjust its transmit power level. In the oth er alternative, each base station (612, 614, 616) adjusts the threshold power level locally witho ut input from other base stations, and uses the threshold power level to adjust its transmit pow er level. Figure 5A.

    30.
    发明专利
    未知

    公开(公告)号：DE60100882D1

    公开(公告)日：2003-11-06

    申请号：DE60100882

    申请日：2001-07-10

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： SALVARANI ALEXANDRO ,  WEAVER CARL FRANCIS

    IPC: H04B7/005 ,  H04W36/20 ,  H04W52/40 ,  H04Q7/38

    Abstract: A method/apparatus identifies other cell interference in a wireless network and determines whether a handoff to an affected base station should occur. In one implementation, a base station of a CDMA-based wireless network continuously monitors reverse link interference levels to detect an increased interference condition, and initiates a CDMA mobile identifying sequence to determine whether the interfering signal source is a proximate mobile being served by a neighboring base station of the network. The affected base station obtains a list of long code masks for mobiles being served by neighboring base stations, and instructs at least one receiver unit to sequentially despread received signals using each of the listed long code masks. When the receiver unit detects a signal transmitted by a non-served mobile, the base station analyzes relative reverse link signal strength for the non-served mobile, e.g., using Ec/Io measurements, to determine whether the non-served mobile is likely be the source of interference. Having determined that a nearby CDMA mobile is the source of interference, the affected base station may initiate one of a number of possible actions, including triggering a handoff to the affected base station so that the affected base station could control the transmit power level of the mobile, requesting that the interfering mobile be switched to a different frequency carrier or dropped, or merely recording the interference condition.

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